As of 2025, —it has not been withdrawn. However, AGMA also publishes ANSI/AGMA 2015-2-A06 , which deals with double-flank composite tolerance (more specialized). Furthermore, the industry is slowly moving toward AGMA 2101 (Fundamental Rating Factors) and fully embracing ISO 1328:2013 for global harmonization.
σt=WtKoKvKsKmKb/(FmtJ)sigma sub t equals cap W sub t cap K sub o cap K sub v cap K sub s cap K sub m cap K sub b / open paren cap F m sub t cap J close paren is the geometry factor for bending, Kbcap K sub b is rim thickness factor, and is transverse metric module or diametral pitch [1]. Factors and Modifiers Explained
Factor: Incorporates the Lewis form factor and a stress concentration factor based on the root fillet radius. 4. Evolution and Legacy of the Standard agma 21801 pdf
Understanding AGMA 218-01: The Standard for Rating Gear Mechanical Strength
Measure:
AGMA 218.01 fundamentally shifted the industry by dividing gear tooth failure into two primary categories:
Every 5–7 years. The latest version as of 2025 is AGMA 21801 (reaffirmed 2020). A revision is expected no earlier than 2026. As of 2025, —it has not been withdrawn
For years, the AGMA 218.01 PDF (or its physical binder) sat on the desk of every serious gear designer. It was a dense collection of complex formulas for calculating exactly how much stress a gear could take before it pitted (surface fatigue) or snapped at the root (bending failure). The document became the guardian of safety for: Movable Bridges:
Disclaimer: This article is for informational purposes only. Engineering design should always be conducted in accordance with the full, official standard document. σt=WtKoKvKsKmKb/(FmtJ)sigma sub t equals cap W sub t
: The standard includes formulas to calculate the surface durability of gear teeth, helping designers prevent premature failure from contact stress.
Once you have a legitimate copy, here is a step-by-step workflow: